Abstract
The marvelous advances made during the last decade in discovering the part played by insects in the transmission of disease have naturally led to a more detailed investigation of the structure of the insects themselves. The Diptera, containing so many forms implicated in this activity, have afforded a rich field for research, and considerable attention has been given in recent years to the detailed morphology of many forms, the culicid and muscoid flies in particular. Progress on the interpretation of the external anatomy of these insects has been made principally on the mouthparts in the case of the blood-sucking flies and on the genitalia for specific differentiations in the case of the mosquitoes. Work on other structures has been neglected to a certain extent.

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